Only build rpm for arm64 and amd64

We don't support all the arch so only build for supported one.

crc-admin-helper.spec.in

@@ -29,6 +29,7 @@ Name:           %{goname}
 Release:        1%{?dist}
 Summary:        CRC's helper with administrative privileges
 License:        MIT
+ExcludeArch:    armv7hl i686 ppc64le s390x
 URL:            %{gourl}
 Source0:        %{gosource}